Furnace-door frame.



L. L. KNOX.

FURNACE DOOR FRAME,

APPLICATION FILED JUNE so, 1908.

Patented Jan. 26, 909.

2 SHEETS-SHEBT 2,

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WITNESSES mam TH: "cams PETERS 0a., wAsnmcruu, :1. c4

ularly to the construction of suepla mvrrnn s LUTHER L. KNOX, OF BEN AVON, PENNSYLVANIA.

To all whom it may concern:

Be it known that l, LUTHER L. Knox, of Ben Avon, Allegheny county, Pennsylvania, have invented a new and useful Improvement in Furnace-Door Frames, of which the following is afull, clear, and exact description, reference being had to the accor anying drawings, forming part of this specl' cation, in which Figure 1 is a front elevation of one form 0 door frame embodying my invention; Fig. is a vertical section on the line llll of Fig. 1; Figs. 3, 4; and 5 are similar sections showing modified forms of the invention; 6 is a front elevation of another form of the in vention; and Fig. 7 is a section on the line Vll-Vll of Fig. 6; Fig. 8 is a section on the line VIH VIH of Fig. 6; and Fig. 9 is a front elevation of still another form of the invention; 10 is a section on the line I; X of Fig. 9; and Fig. 11 is a plan view of the form snown in Figs. 9 and 10.

My invention has relation to furnace door frames, and particularly to frames of the general character described and claimed in my Patent No. 864,752, dated 3i h, 1907. The frame described in that patent consists of a main frame provided with a door opening therein, and a supplemental frame member arranged to fit within the said ing to form a surrounding rim therefo wholly or in part, means being prov.

circulating a cooling fluid within the sup lemental member. This supplemental frame member constitutes that portion of ti as which is most subject to the destrucnv of the furnace, and is so arranged thati be readily removed and laced burned out; and since this fr forms but a comparatively small part of the door "rame as a whole, this renewal and replacement can be effected at a comparatively small cost and without dismantling the furnace.

The present invention relates more particmental frame, whereby it is provided means for supporting an arch of refracto y material, said arch constituting a portion of the upper wall of the door opening into furnace.

A further object of the invention is to provide this supplemental frame with a detachable top or lintel portion which can be removed and replaced by itself and independently of the supplemental frame as a whole.

Elpecification of Letters Patent.

Patented Jan. 26, 1909.

Serial No. Ll'YQ.

The precise nature of my invention will be best understood by reference to the accompanying drawings, in which I have shown several embodiments thereof, and which will now be described, it being premised, however, that it is susceptible of various other modifications by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Referrin first to the form of the invention shown in Figs. 1 and 2, the numeral 2 designates the main metallic member of the door frame, which is here shown as of substantially the same construction as in my said patent above referred to. 3 is the supplemental frame, which, as in the said patent, consists of a rim-like hollow structure, which is adapted to fit within the door opening a of the main frame, and is cletachably secured to said main frameby any suitable means such as the lugs 5 at its lateral edges, which engage recesses 6 in the main frame, and are held therei' by means of suitable keys 7. 8 designate connections, whereby a cooling fluid may be circ"; lated through the supplemental frame. Any suitable arrangement of baffling may be provided within the supplemental frame for effecting a proper circulation of water therein. in accordance with my present invention, the upper portion of this supplemental frame is provided with the skewbaclrs 9, which support the arch 10 of refractory material which forms a lining for the top or lintel portion of the supplemental frame and which forms a continuation of the brickworl: arch over the door opening through the furnace wall. By providing the top or lintel portion of the supplemental frame with these slr .v-baclrs, a ef actory lining can be provised. therefor w ich protects the frame from destruction, and winch is itself protected by the cooling action of the frame, this refractory lining being furthermore readily remova ble and replaceable, either with or independently of the supplemental frame.

The construction shown in Fig. 3 differs rrom that shown l lgs. 1 and 2, in that the to) or lintel portion 11 of the supplemental refractory lining 13. It will be noted that frame is made as separate piece and is of this refractory lining does not extend entirely to the front of the furnace, but that the skewbacks are carried by the inwardly projecting ortion 12. The separate top or lintel 11 has detachable circulating connections 14 with the side legs of the table frame.

Fig. 4 shows another form of the supplemental frame, in which the top or lintel portion 15 is also made detachable, but in this case the skew-backs which support the refractory lining 16 extend entirely to the front of the frame.

The form shown in Fig. 5 is similar to that shown in Fig. 3, except that the frame is of slightly different cross-section so as to carry a straight-walled arch lining instead of an upwardly and inwardly inclined arch as shown in Fig. 3. The top or lintel portion of the frame is in this form made in one piece with the leg portions.

Figs. 6, 7 and 8 show a construction simi lar to that of Fig. 4, except that the skewbacks on the removable top or lintel section 17 are omitted. This top or lintel portion is also shown as being provided with a plurality of interior baffles 18 for effecting a back and forth water circulation therethrough. The circulating pipes 19 instead of being brought out at the center of the main frame, as in the forms before described, are brought out one at each side portion of the main frame in recesses between the flanges 20, over which the usual door is arranged to slide. in this form the side legs 21 are shown as having the outward extensions which fit over the side legs of the main frame in the manner shown in Fig. 8.

In the form shown in Figs. 9, 16 and 11, the top or lintel portion of the supplemental frame is formed integrally with the side legs, and consists of two portions 23 and 24, the portion 23 being offset inwardly with respect to the portion 24, and into the brick wall, and having skew-baolrs 25 which support the refractory lining arch 26.

It will be understood that in any of the different forms of my invention which I have shown, the top or lintel portion may be either detachable or in one piece with the side portions. It will also be noted that in the form shown on sheet 2, the side legs of the supplemental frame are not connected at the bottom, as in the other form. This bottom leg or connection may or may not be used with any of the several forms shown.

The advantages of my invention will be readily appreciated by those familiar with this art, since it provides a door frame in which the parts which are most subject to the destructive action of the heat from the furnace can be readily renewed and replaced without disturbing the door frame as a whole, and at a comparatively slight cost.

By providing the top or lintel portion of the supplemental frame with skew-backs for sup orting the arch or lining, if the brick worr at the sides of the door-opening becomes burned out or destroyed, the supports for the arch or lini 1g formed by the skewbacks remains intact.

I claim 1. A furnace door frame consisting of a main frame member, and a separate supplemental or rim frame member removably fitting within the door opening of the main member and having a top or lintel portion formed separately from its side legs; substantially as described.

2. A furnace door frame consisting of a main metallic member having a door opening therein, and a separate supplemental frame member removably fitting within said door opening and consisting of a hollow rimlike structure, said supplemental frame member having its top or lintel portion formed in a separate piece, and means for circulating a cooling fluid through said sup plemental member; substantially as described.

3. A furnace door frame consisting of a main member having a door opening therein, and a supplemental member in the form of a rim-like structure arranged to fit within the opening in the main frame member, and hav ing skew-baclrs at its upper portion for supporting an arch or lining of refractory material; substantially as described.

4. A furnace door frame consisting of a main frame member having a door opening therein, and a supplemental frame member in the form of a hollow rim-lilre structure arranged to fit within said opening and to extend inwardly into the wall of the furnace and to be detachably secured to the main frame member, and an arch or linin of refractory material carried by the supplemental frame member; substantially as described.

5. A furnace deer frame consisting of a main frame member having a door opening therethrough, and a supplemental frame member fitting within said opening and detachably secured to the main frame member, said supplemental frame member having a portion extending inwardly into the furnace wall and provided with means for supporting an arch or lining of refractory material, and means for circulating a cooling fluid through the supplemental frame member; substantially as described.

6. A furnace door frame having skewbaclrs, and a refractory arch or lining carried by said skew-bacl s and supported thereby independently of the adjacent brick work of the furnace; substantially as described.

In testimony whereof, I have hereunto set my hand.

LUTHER L. KNOX. Witnesses Gno. H. PARMELEE, H. M. Conwnv. 

